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4a-5=2a-19
We move all terms to the left:
4a-5-(2a-19)=0
We get rid of parentheses
4a-2a+19-5=0
We add all the numbers together, and all the variables
2a+14=0
We move all terms containing a to the left, all other terms to the right
2a=-14
a=-14/2
a=-7
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